EP1665851B1 - Controle dans un reseau de telecommunications - Google Patents

Controle dans un reseau de telecommunications Download PDF

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Publication number
EP1665851B1
EP1665851B1 EP03818594A EP03818594A EP1665851B1 EP 1665851 B1 EP1665851 B1 EP 1665851B1 EP 03818594 A EP03818594 A EP 03818594A EP 03818594 A EP03818594 A EP 03818594A EP 1665851 B1 EP1665851 B1 EP 1665851B1
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EP
European Patent Office
Prior art keywords
media flow
monitoring
subscriber
domain
acnw
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03818594A
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German (de)
English (en)
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EP1665851A1 (fr
Inventor
Bo EKSTRÖM
Sören Wallinder
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Publication of EP1665851A1 publication Critical patent/EP1665851A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/50—Network service management, e.g. ensuring proper service fulfilment according to agreements
    • H04L41/5061—Network service management, e.g. ensuring proper service fulfilment according to agreements characterised by the interaction between service providers and their network customers, e.g. customer relationship management
    • H04L41/5067—Customer-centric QoS measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/50—Testing arrangements
    • H04L43/55—Testing of service level quality, e.g. simulating service usage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/30—Network architectures or network communication protocols for network security for supporting lawful interception, monitoring or retaining of communications or communication related information
    • H04L63/304—Network architectures or network communication protocols for network security for supporting lawful interception, monitoring or retaining of communications or communication related information intercepting circuit switched data communications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/80—Arrangements enabling lawful interception [LI]

Definitions

  • the present invention relates to methods and arrangements for monitoring media flow in a telecommunication network that comprises a control domain that handles session control and a bearer domain that handles the media flow.
  • circuit switched networks e.g. telephony networks
  • circuit switched networks e.g. telephony networks
  • it is customary to monitor communication connections from a remote operation centre so that a network operator wishing to operate real time traffic can constantly receive information on the quality of the communication lines.
  • Another application of monitoring is lawful interception, i.e. the act of intercepting a communication on behalf of a law enforcement agency.
  • WO 01/91374 A1 relates to a method for intercepting packets in a packet oriented network. This is performed by copying information from a packet being transmitted in the network and transmits the copied information to a monitoring means.
  • WO 02/056622 A1 relates to a method of activating rerouting of a data link in malfunction.
  • a monitoring element is hereby arranged for monitoring the state of the critical access point used by the data link.
  • US 2002/0077091 shows a method for call forwarding, for example, from a fixed-wire telephone to a mobile telephone. Hereby monitoring of the subscriber equipment from which calls have been forwarded is performed in order to see whether the user takes some pre-defined action, such as lifting the receiver. If such action is detected, the call is re-routed.
  • an IMS subscriber In a 3GPP environment an IMS subscriber is able to roam between different access lines without necessarily being a subscriber in the backbone or access networks.
  • the identification of the target may therefore require an extensive co-ordination of information from IMS and the backbone network and access network.
  • the present invention relates to problems how to handle monitoring of a media flow when session control and media flow uses different paths.
  • problems arise when subscribers involved in the media flow move between different access networks.
  • the problems are solved by the invention by re-routing the session for which monitoring is desired, via a dedicated server function having a fixed location, which location is independent of change of location of subscribers involved in the media flow.
  • the media flow that passes the dedicated server function is then monitored.
  • the problem is solved by a method for monitoring media flow in a telecommunication network.
  • the network comprises a control domain and a bearer domain. Session control is handled in the control domain and media flow is handled in the bearer domain.
  • the method comprises the following steps:
  • An arrangement according to the invention comprises means for performing the above mentioned method steps.
  • the object of the present invention is to make it possible to perform real-time monitoring of Content of Communication flow.
  • An advantage with the invention is that monitoring can be accomplished with a minimum of signalling between control- and bearer domain, also when the monitored subscriber roams between different access networks.
  • Another advantage is that a minimum of adaptations of the normal network functions is required.
  • Yet another advantage is the possibility to conceal interception to involved subscribers and to other networks.
  • Intercept Related Information IRI is defined as signalling information related to subscribers.
  • Figure 1 belongs to prior art and discloses a first mobile subscriber A and a second mobile subscriber B.
  • the subscriber A is located in a first access network ACNW-A, which network is subscriber A's home location.
  • Subscriber B is located in a second access network ACNW-B.
  • Media flow MF for example speech, is communicated between the subscribers A and B via a backbone network BBNW.
  • the media flow is transported in a path in the bearer domain BD.
  • the control of the media flow takes place in the control domain CD. Control information can for example be, signalling during set-up of a call.
  • the control information related to the A subscriber is handled in the IP multimedia subsystem domain IMS-A and the control information related to the B subscriber is handled in the IP multimedia subsystem domain IMS-B.
  • the control information passes several Call/Session Control Functions CSCF in both IMS-A and IMS-B.
  • Requirements for interception of control information also called Intercept related information IRI, are being standardised within the 3GPP and ETSI.
  • Figure 1 discloses interception of IRI according to prior art.
  • the control information is hereby copied into a lawful interception database LI-DB located in relation to a serving CSCF in IMS-A, i.e. S-CSCF-A.
  • the information is then forwarded from the LI-DB to a lawful interception monitoring facility LEMF, where the IRI is monitored.
  • Information that is of interest to monitor can for example be if a certain subscriber has made a call, to whom the call was made and for how long time.
  • the media flow MF between the subscribers is routed via an edge-node EDGE-A in the access network ACNW-A, the backbone network BBNW and via an edge-node EDGE-B in the access network ACNW-B.
  • Figure 2 discloses interception according to the invention.
  • the figure shows the same network as was disclosed in figure 1 .
  • a database for example the lawful interception database LI-DB contains identification of what subscribers that are to be monitored.
  • LI-DB contains identification of what subscribers that are to be monitored.
  • the first subscriber A is to be monitored and consequently an identification of A is stored in LI-DB.
  • monitoring according to the invention takes place.
  • the call set-up in this example involves the two IP multimedia domains IMS-A and IMS-B whereby control signalling is transferred between the domains.
  • an indicator FLAG is sent in connection with a call set-up involving the selected subscriber A, from the serving control function S-CSCF-A, via an interrogating control function P-CSCF-A to the access network ACNW-A.
  • the FLAG is forwarded to the edge node EDGE-A in ACNW-A.
  • a further node function i.e. a dedicated so-called lawful interception server function LI-S is initiated in ACNW-A.
  • the LI-S is initiated by using an address that is predefined in EDGE-A to be used for re-routing of media flow via LI-S after arrival of the indicator FLAG.
  • LI-S initiates a 3-part "conference" between A and B (the two original users) and a third user i.e. a Distribution Function DF.
  • the distribution function is only a listener and is not to be recognised by A and B. Even if subscriber A should move from ACNW-A to another network, the media flow would still be routed via LI-S. The signalling in the control domain CD will by this be minimised. This can be seen in a third embodiment together with figure 5 .
  • the DF forwards all the content flowing in both directions between A and B, from LI-S to a Lawful interception Enforcement Monitoring Function LEMF.
  • the indicator FLAG might contain an adjusted IP address, which is used by the edge node to address LI-S. In this case no address to LI-S has to be predefined in the edge node.
  • the location of LI-S is an example and that LI-S as well might be initiated somewhere else, for example in the backbone network BBNW.
  • the server function LI-S does not have to be located in a physically separated server function.
  • FIG 3 some essential steps of the invention is disclosed in a flowchart.
  • the flowchart is to be read together with the earlier shown figure 2 .
  • the method according to the invention comprises the following steps:
  • FIG. 4 shows parts of the network that has been disclosed in figure 2 .
  • the media flow MF is like in the earlier embodiments communicated between the first subscriber A and the second subscriber B.
  • the media flow is hereby communicated via the edge-node EDGE-A in the access network ACNW-A, the lawful interception server function LI-S in ACNW-A and via the edge-node EDGE-B in the access network ACNW-B.
  • a different addressing scheme has been implemented in this embodiment.
  • the inherent notification of the LI-S address is unknown by the edge node during the whole monitoring session.
  • the different addressing scheme is set-up after reception of the notification to EDGE-A, that subscriber A is to be intercepted.
  • the media flow is re-routed via the lawful interception server function LI-S, but in this second embodiment the routing will be hidden.
  • the edge-node is hereby unaware of the lawful interception server function LI-S and the subscriber A can not reach information about LI-S from the edge-node.
  • LI-S unknown to EDGE-A
  • the edge-node will send a request message 1 to the IP multimedia subsystem domain IMS-A asking for an address to subscriber B to forward the packet to.
  • the IMS-A replies to EDGE-A by sending a reply message 2 with an address to LI-S, and EDGE-A uses this address to forward the packet to LI-S.
  • the LI-S send a request message 3 to the IP multimedia subsystem domain IMS-A asking for an address to forward the packet to.
  • the IMS-A replies to EDGE-A by sending a reply message 4 with an address to the second subscriber B.
  • the already mentioned third embodiment is disclosed in figure 5 .
  • the first subscriber A has, like in the earlier two embodiments, its home location in the first access networks ACNW-A. In this third embodiment however, the subscriber A has moved temporarily to another network ACNW-C.
  • ACNW-C comprises an edge node EDGE-C.
  • the IP multimedia subsystem domain IMS-A will be involved in the session initiation between subscriber A and another subscriber, subscriber B in this case.
  • the indicator FLAG will in this case be sent from IMS-A to ACNW-C via an IP multimedia subsystem IMS-C.
  • the indicator FLAG contains in this case an adjusted IP address, which is used by the edge node EDGE-C to address LI-S.
  • the media flow MF between A and B will then be routed via the lawful interception server function LI-S which is located in ACNW-A.
  • LI-S which is located in ACNW-A.
  • data packets in the media flow MF from subscriber A will be sent from the edge node EDGE-C, via LI-S in ACNW-A, to EDGE-B.
  • Data packets in the media flow from subscriber B will be sent from EDGE-B, via LI-S in ACNW-A, to EDGE-C.
  • the media flow between the subscribers A and B is now routed to go via the lawful interception server function LI-S.
  • LI-S initiates a 3-part "conference" between A and B (the two original users) and the Distribution Function DF.
  • the distribution function is only a listener and is not to be recognised by A and B.
  • the lawful interception server function LI-S can for example be located in the backbone network BBNW or within the edge node EDGE-A.
  • the two subscribers A and B can be situated in the same access network or in different access networks in different countries.
  • the subscriber A is the monitored subscriber and if using standard telecommunication terminology it can be assumed that the subscriber A also is the calling subscriber while subscriber B is the called subscriber.
  • the claimed invention also covers cases when the monitored subscriber is the called subscriber. Also conference calls involving more than two parties is covered by the claimed invention and of course also when more than one subscriber in the conference is monitored.
  • the subscriber unit for which interception is desired may have roamed to an access network in another country than the country of the subscribers home access network. It is important to observe that interception only is one type of monitoring for which the invention is applicable. Other types of monitoring might for example be monitoring of the type of media flow or quality measurements monitoring.
  • the flag indicator is in the example sent during the call set-up session but can of course also be sent after the call set-up has finished in which case the media flow is re-routed via the lawful interception server function.

Claims (11)

  1. Procédé pour contrôler un flux de média dans un réseau de télécommunication comprenant un domaine de commande, traitant une commande de session, et un domaine de support, traitant un flux de média, lequel procédé comprend les étapes suivantes qui consistent :
    - à stocker dans une base de données (LI-DB) dans le domaine de commande, une identification d'un premier abonné (A) pour lequel un contrôle est souhaité ;
    - à établir une connexion entre le premier abonné (A) situé dans un premier réseau d'accès (ACNW-A) et un second abonné (B) ; caractérisé par
    - l'envoi d'un indicateur (FLAG) du domaine de commande au domaine de support du premier réseau d'accès indiquant qu'un flux de données impliquant le premier abonné (A) doit être contrôlé ;
    - le déclenchement d'une fonction de serveur dédié (LI-S) dans le domaine de support du premier réseau d'accès et le réacheminement dudit flux de média entre les abonnés, en passant par la fonction de serveur dédié (LI-S) ;
    - le contrôle du flux de média qui passe par la fonction de serveur (LI-S).
  2. Procédé pour contrôler un flux de média dans un réseau de télécommunication selon la revendication 1, dans lequel le premier abonné (A) change d'emplacement du premier réseau d'accès (ACNW-A) à un autre réseau d'accès (ACNW-C), dans lequel une adresse ajustée est reçue du domaine de commande au domaine de support de l'autre réseau d'accès (ACNW-C) et dans lequel le flux de média est réacheminé du premier abonné (A) au second abonné (B) en passant par la fonction de serveur dédié (LI-S) dans le premier réseau (ACNW-A).
  3. Procédé pour contrôler un flux de média dans un réseau de télécommunication selon la revendication 1, dans lequel le flux de média passe par un noeud de bord (EDGE-A) dans le domaine de support du premier réseau d'accès (ACNW-A) et par lequel le déclenchement de la fonction de serveur dédié est exécutée après la réception de l'indicateur (FLAG) au noeud de bord (EDGE-A).
  4. Procédé pour contrôler un flux de média dans un réseau de télécommunication selon la revendication 3, dans lequel la fonction de serveur dédié (LI-S) est déclenchée par l'utilisation d'une adresse prédéfinie dans le noeud de bord (EDGE-A).
  5. Procédé pour contrôler un flux de média dans un réseau de télécommunication selon l'une quelconque des revendications précédentes, comprenant en outre l'étape suivante qui consiste :
    - à échanger une adresse à la fonction de serveur dédié (LI-S) contre une pseudo-adresse, afin de masquer l'acheminement du flux de données passant par la fonction de serveur (LI-S) pour les abonnés impliqués (A et B).
  6. Procédé pour contrôler un flux de média dans un réseau de télécommunication selon l'une quelconque des revendications précédentes, comprenant en outre l'étape suivante qui consiste :
    - à établir une conférence à trois parties entre les deux abonnés impliqués (A et B) et une fonction de contrôle (LEMF), la fonction de contrôle étant une fonction uniquement d'auditeur.
  7. Montage apte à contrôler un flux de média dans un réseau de télécommunication comportant un domaine de commande, traitant une commande de session, et un domaine de support, traitant un flux de média, lequel montage comporte :
    - un moyen destiné à stocker dans une base de données (LI-DB) dans le domaine de commande, une identification d'un premier abonné (A) pour lequel un contrôle est souhaité ;
    - un moyen destiné à établir une connexion entre le premier abonné (A) se trouvant dans un premier réseau d'accès (ACNW-A) et un second abonné (B) ; caractérisé par
    - un moyen destiné à envoyer un indicateur (FLAG) du domaine de commande au domaine de support du premier réseau d'accès indiquant qu'un flux de média impliquant le premier abonné (A) doit être contrôlé ;
    - un moyen destiné à déclencher une fonction de serveur dédié (LI-S) dans le domaine de support du premier réseau d'accès et à réacheminer ledit flux de média entre les abonnés, en passant par la fonction de serveur dédié (LI-S) ;
    un moyen destiné à contrôler le flux de média qui passe par la fonction de serveur (LI-S).
  8. Montage apte à contrôler un flux de média dans un réseau de télécommunication selon la revendication 7, dans lequel le premier abonné (A) change de position du premier réseau d'accès (ACNW-A) à un autre réseau d'accès (ACNW-C), lequel montage comporte un moyen destiné à recevoir une adresse ajustée depuis le domaine de commande vers le domaine de support de l'autre réseau d'accès (ACNW-C) et un moyen destiné à réacheminer le flux de média du premier abonné (A) au second abonné (B) en passant par la fonction de serveur dédié (LI-S) dans le premier réseau (ACNW-A).
  9. Montage apte à contrôler un flux de média dans un réseau de télécommunication selon l'une des revendications 7 et 8, dans lequel le flux de média passe par un noeud de bord (EDGE-A) dans le domaine de support du premier réseau d'accès (ACNW-A) et lequel montage comporte un moyen destiné à exécuter le déclenchement de la fonction de serveur dédié après la réception de l'indicateur (FLAG) au noeud de bord (EDGE-A).
  10. Montage apte à contrôler un flux de média dans un réseau de télécommunication selon l'une quelconque des revendications 7 à 9, comportant un moyen destiné à échanger une adresse pour la fonction de serveur dédié (LIS) contre une pseudo-adresse.
  11. Montage apte à contrôler un flux de média dans un réseau de télécommunication selon l'une quelconque des revendications 7 à 10, comportant un moyen destiné à établir une conférence à trois parties entre les deux abonnés impliqués (A et B) et une fonction de contrôle (LEMF), la fonction de contrôle étant uniquement une fonction d'auditeur.
EP03818594A 2003-09-05 2003-09-05 Controle dans un reseau de telecommunications Expired - Lifetime EP1665851B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2003/001391 WO2005025257A1 (fr) 2003-09-05 2003-09-05 Controle dans un reseau de telecommunications

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EP1665851A1 EP1665851A1 (fr) 2006-06-07
EP1665851B1 true EP1665851B1 (fr) 2009-05-06

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Country Status (7)

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US (1) US20060268921A1 (fr)
EP (1) EP1665851B1 (fr)
CN (1) CN100488309C (fr)
AT (1) ATE431056T1 (fr)
AU (1) AU2003258935A1 (fr)
DE (1) DE60327562D1 (fr)
WO (1) WO2005025257A1 (fr)

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ATE431056T1 (de) 2009-05-15
EP1665851A1 (fr) 2006-06-07
WO2005025257A1 (fr) 2005-03-17
US20060268921A1 (en) 2006-11-30
AU2003258935A1 (en) 2005-03-29
CN1826829A (zh) 2006-08-30
DE60327562D1 (de) 2009-06-18
CN100488309C (zh) 2009-05-13

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